Pneumatophores are the aerial root systems that allow mangroves to get oxygen as the mud they live in is anaerobic. Great crested grebes A wind-rippled sand dune in

A wind-rippled sand dune in the Little Sahara Desert

An Australian kestrel (Falco cenchroides) perched on a bale of hay

Discarded telephone and electricity supply cables destroyed by a fire

A fireplace is removed from a Victorian home during a renovation

Sunset touches the summit of a mountain overlooking an alpine lake

Pneumatophores are the aerial root systems that allow mangroves to get oxygen as the mud they live in is anaerobic. Great crested grebes A wind-rippled sand dune inPneumatophores are the aerial root systems that allow mangroves to get oxygen as the mud they live in is anaerobic. Porosus Creek, Hunter River, Kimberley Coast, Western Australia, Australia.